Restrictions in The Language Compiled
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In order to allow one pass compilation ALGOL 68-R implemented a sub-set of the language defined in the original report:
- Identifiers, modes and operators must be specified before use.
- No automatic proceduring.
- Explicit void mode.
- No formal declarers.
- No parallel processing.
- goto may not be omitted.
- Uniting is only valid in strong positions.
Many of these restrictions were adopted by the revised report on ALGOL 68.
Read more about this topic: ALGOL 68R
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